Forests are useful in fighting the effects of air pollution because they produce
A. Carbon B. Oxygen C. Hydrogen D. Carbon dioxide

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.

because the early people found out about it.

answer; generalizability;